According to a 2014 study, 1 in 10 Americans think HTML is a sexually-transmitted disease.
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In the UK, there's a guy named 'Major Dickie Head'.
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On April Fool's Day in 1977, the UK newspaper The Guardian ran a 7 page feature on the discovery of the fictitious island nation of "San Seriffe."
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The Mona Lisa has no eyebrows. It was the fashion in Renaissance Florence to shave them off!
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